[CS] Build on more rubies
[BUGFIX] Exception type matching to satisfy Ruby 2.0
[DOC] Specify JRuby 1.7.0 as the minimum supported version
[CS] Require external libraries only where they are needed
[CS] Don't fake actor supervision

* Stop shutting down all actors between specs
[CS] Allow failures on Rubinius

There seems to be a bug in Rubinius core holding us back: https://github.com/rubinius/rubinius/issues/2116
[BUGFIX] Wait a moment for the supervisor to restart
Merge branch 'feature/jruby' into develop